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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f09322addfa6bed005425e9a444af2ed05b07847fc4635691b325ea5ef7396c' 
  AND token = 'OmtvZL611PW5J6g1TnxMAj3OdwB+4Wu95LdyKgYsGO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}